Hill's Hobbies had an entire set available at the last Chicago show. They were all painted. I think it was $12K for 8 cars. I think there was another entire set at that show that was about $15K for 12 cars. I don't recall either set selling.
To contact the Hill's go to the March Meet website and contact Melissa. It was her father's set, if it is still available.
An alternative for the serious DIYer would be to get the Kemtron brass kit cars from DesPlaines hobbies. Mike Mangini had a finished set of Kemtron cars at O Scale West last year that I think he had available for sale. There were also several Kemtron cars in various states of completion in Lou Cross's estate and I think several didn't sell if you want to contact Jay Criswell.
How close they would come to the Wasatch cars would depend on how much effort you put into them and believe me it would be a LOT of work. You're on your own on the underframes.